CVE-2026-72298net: qrtr: fix 32-bit integer overflow in qrtr_endpoint_post()

Official description

In the Linux kernel, the following vulnerability has been resolved: net: qrtr: fix 32-bit integer overflow in qrtr_endpoint_post() qrtr_endpoint_post() validates an incoming packet with if (!size || len != ALIGN(size, 4) + hdrlen) goto err; where size comes from the wire. On 32-bit, size_t is 32 bits and ALIGN(size, 4) wraps to 0 for size >= 0xfffffffd, so the check passes and skb_put_data(skb, data + hdrlen, size) writes past the hdrlen-sized skb and oopses the kernel. 64-bit is unaffected. This is the 32-bit residual of ad9d24c9429e2 ("net: qrtr: fix OOB Read in qrtr_endpoint_post"), which fixed only the 64-bit case. Reject any size that cannot fit the buffer before the ALIGN.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/3665e644ea081c4624a1637023b0de3b29f4ae04
• https://git.kernel.org/stable/c/b609f7f46916c6b05585ca82455077198a23770f
• https://git.kernel.org/stable/c/242408b5b763c01288adf3113cbce84378a76e1a
• https://git.kernel.org/stable/c/d0597074e99731fdad5593e4f6d056a3866f2cab
• https://git.kernel.org/stable/c/689b7267f8632b4661879dc323e26ebb60978afb
• https://git.kernel.org/stable/c/22100a8f73d4ae4f17697dae93d4e2e1d283a6ec
• https://git.kernel.org/stable/c/7f72c285f6d3bf63968a0344beee8ab1b370198b
• https://git.kernel.org/stable/c/20054869770c7df060c5ecee3e8bbf9029c47191